Chuck



Julie 13, 1933. k A. P; FOX

CHUCK Filed Dec. 2, 1951 WWW/ \XXXXXXXXXMXXWX XXXYW aa wausz &

Patented June 13, 1933 UN 'rEn sa'aras ALEXANDER P. FOX, OF ST. LOUIS,MISSOURI, ASSIGNOR T0 LINCOLN ENGINEERING- COMPANY, OF ST. LOUIS,MISSOURI, A CORPORATION OF MISSOURI CHUCK Application filed December 2,1931.

This invention relates to chucks, and with regard to certain morespecific features, to automatic chucks for coupling air lines and thelike.

Among the several objects of the invention may be noted the provision ofan automatic chuck for quickly attaching and detaching air hoses and thelike to and from suitable fittings, the latter also comprising part ofthis invention; the provision of a chuck of the class described whichopens automatically upon application and closes automatically upon thedetachment; the provision of a device of this class which isautomatically self-sealing when attachment is made; and the provision ofa device of the class described which is simple and effective inoperation and economical to manufacture. Other objects will be in partobvious and in part hereinafter described.

The invention accordingly comprises the elements and combinations ofelements, features of construction, and arrangements of parts which willbe exemplified in the struc ture hereinafter described, and the scope ofthe application of which will be indicated in the following claims.

In the accompanying drawing, in which is illustrated one of variouspossible embodiments of the invention.

Fig. 1 is aside elevation showing the chuck in the process of beingapplied to a fitting;

2 is a longitudinal section of the chuck; and,

Fig.3 is a bottom plan view of the chuck,

the same being taken substantially along and viewed from line 33 ofFig.1.

Similar reference characters indicate corresponding parts throughout theseveral views of the drawing.

Referring now more particularly to Fig. 1, there is illustrated atnumeral 1 appara tus which it is desired to provide with compressed airor the like, said apparatus 1 having thereon a fitting 3 comprising ahollow stem 5, crosswise of which is located an inserted pin 7 formingbayonet trunnions. The fitting 3 is provided at its lower end withsuitable attaching threads 9 and a Serial No. 578,449.

nature that the chuck herein described is to I be applied, said chuck tobe automatically opened to deliver air to the fitting 3 when appliedthereto, and to automatically effect a definite seal against air leakageduring this period.

At numeral 13 is shown the outlet from a pressure air hose. Threaded tothe outlet 13 is a nipple 15 to which is attached a body portion 17, theattachment being made by means of threads 19 and a suitablepackinggasket 21.

The body portion 17 is interiorly counterbored as shown at numeral 23,for the reception of a resilient valve seat 25, and avalve having a stem27 and a head 29, the

'head being acted upon by means of a spring 31, the latter reactingagainst said nipple 15. When the chuck is in the position shown in Fig.1, the spring 31 normally holds the head 29 against the seat 25, thussealing off flow of air from the air hole. Thus, automatically, no airis released when the chuck is disconnected.

Below said counterbore 23is a second counterbore 33, said counterbores23 and 33 beingseparated by a wall 35. The valve stem 27 passes looselythrough a suitable opening 37 in the valve seat 25, and said wall 35.

In the lower counterbore 33, said valve stem 27 is provided with a head39 having a milled slot 41 on its bottommost face. A third and largercounterbore 43 forms an extension of the counterbore 33 and containstherein a washer 45. The washer 45 is provided with a central opening 47forming a slidable guide'for the fitting 3 when the chuck is appliedthereover. The wash er 45 also has a series of peripheral openings 49for permitting access of air under pressure sidewardly of the fitting.This air performs the function of sealing itself and The concave portionof the U-shape faces the direction of air pressure. The packing orgasket 51 has an interior opening therethrough which is substantiallyequal to the diameter of the opening 47 in the washer 45. A holder 55 isprovided for the gasket 51, said holder 55 being backed up by a threadedcap 57 located in the end of a swivel barrel or body portion 59, thelatter being knurled for gripping purposes. The outer body 59 isrotatably borne on the inner body 17 along a bearing (31 and isprevented from assuming endwise movements by a flange 63 and said cap57.

It will be seen by examining Fig. 2 that the lower head 39 of the valvestem 27 is adapted to engage the upper end of the fitting 3 when thechuck is applied thereover, and by pressing the valve against spring 31serves to open said valve. This permits the flow of air through thevalve and into the fitting 3 by way of said milled slot 41.

Some of the air is also by-passed to the exterior of the fitting 3 whereit tends to spread the U-shaped, lipped gasket 51 into sealing positionagainst the fitting 3. It is clear that when the chuck is removed, thevalve automatically closes, thus also closing off the supply of airbehind the gasket 51. Hence the gasket is easy to apply over the nextfitting to be provided with air. It is clear that by a bayonetconnection there is herein intended one in which longitudinal and rotarymovement is used for effecting a connection.

In order to effect a definite connection with the fitting, the cap 57 isprovided with bayonet notches 65 for passage around the bayonet pin 7and interior bayonet recesses 67 at right angles thereto forreceivingthe v bayonet pin 7 upon a ninety degree rotation.

The spring 31 provides part of the reaction for maintaining the head 57up against the cross pin 7 when the latter is posltioned in the interiornotches 67. The air pressure likewise is a factor in holding the couplerin place in addition to the spring, as it exerts {pressure over the areaof the wall of the tting. In order that an operator may sense aboutwhere the interior notches 67 are, exterior raised portions 69 areprovided opposite them, so that the positions of the interior notchesare known by sight as well as the clicking sound accompanying seating ofthe in. P To operate the device, it is only necessary to grasp theknurled outer body 59 and apply the bayonet opening 65 around and overthe bayonet pin 7 and thus cause an engagement between the lower valvehead 39 and the upper end of the fitting 3. The valve is thusautomatically opened. At the same time the body 59 is twisted so thatthe bayo net pin 7 assumes a position in the interior recesses of 67,the spring 31 providing the necessary reaction to hold the same inplace.

As the above action is effected, the air rushes into the fitting, due tothe instantaneous opening of the valve. At the same time it rushes inbehind the gasket 51 and causes the said gasket to seal itself againstthe fitting 3 and prevent leakage of air.

Among the advantages of the invention are the fact that there is apositive seal against leakage and this seal is effected substantiallyonly when the gasket is in its proper position on the fitting 3. Thusany friction due to sealing is not constantly present, and hence not sodisadvantageous, when applying or removing the chuck to and from thefitting. Furthermore, a definite alignment of chuck fitting is assuredin making a placement, this being accomplished by the guide head 57,guide washer or spider 45 and the gasket 51.

It will be observed that the valve 29 is not unseated or disturbed untilafter the sealing against the fitting is effected.

It will also be apparent that the function of the swiveling feature ofthe outer sleeve 59 and head or body 17 is to prevent disengagingagainst hose twist or movement when the coupling is engaged.

In view of the above, it will be seen that the several objects of theinvention are achieved and other advantageous results attained.

As many changes could be made in carrying out the above constructionswithout departing from the scope of the invention, it is intended thatall matter contained in the above description or shown in theaccompanying drawing shall be interpreted as illustrative and not in alimiting sense.

I claim:

1. In combination, a bayonet fitting having a cylindrical exteriorsurface, a chuck adapted to cooperate with said fitting and comprisingan inner body, an outer body, said bodies being relatively rotatable,the latter being adapted to cooperate with said bayonet fitting toeffect a bayonet connection upon longitudinal and rotary motion, a valvewithin the inner body adapted to be automatically opened when saidlongitudinal motion is effected, and a recess in said inner bodysurrounding said fitting and having a gasket therein adapted to slidablycooperate with said cylindrical portion of the fitting, said gaskethaving a U-shaped cross section whereby air tending to leak cxteriorlyof the fitting causes the gasket to react and press against the innerbody and the fitting when a connection is made but to relieve thereaction when a connection or disconnection is effected, and guidingmeans in said recess for engaging said fitting, said guiding meansincluding at least one opening for effecting delivery of air to saidgasket.

2. A chuck comprising a body, said body having a valve port therein, asprmg-p valve adapted to close said port, means on I said valve adaptedto be engaged by that with which the chuck connects to open said valve,said body also having a recess surrounding that which is engaged, and agasket in the recess, adapted to seal with that which is engaged, saidgasket being adapted to increase its sealing effect as any tendency orair to leak is increased and comprising an annular member having aU-shaped cross section, the concave portion of which faces the directionof air pressure, a 'guide opposite said concave portion having means fortransmitting air to the gasket, and holding means on the convexside ofsaid gasket.

3. In combination, a bayonet fitting having a cylindrical exteriorsurface, a chuck adapted to cooperate with said fittingxziid comprisingan inner body, an outer y, said bodies being relatively rotatable, thelatter being adapted to coo rate with said bayonet fitting to efl'ect aayonet connection upon longitudinal and rotary motion, and a recess insaid inner body surrounding said fittin and having a gasket thereinadapted to sli ably cooperate with said cylindrical portion of thefitting, said gasket having a cross section of such a form that airtending to leak exteriorlyof the fitting causes the gasket to react andpress a inst the fitting when a connection is m 0 but to relieve thereaction when a connection or disconnection is effected, and idi meansin said recess for engaging said fitting, said guiding means includingat least one openmg for effecting delivery of air to said gasket.

In testimony whereof, I have signed my name to this specification this28th day of, November, 1931. ALEXANDER P. FOX.

